Agar was first introduced into the laboratory in 1881. Since then, microbiologists have depended on agar to create strong jellies. When microorganisms are streaked or plated onto this jellied surface and incubated, individual cells multiply into distinct colonies that scientists can easily observe, select, and propagate for further experiments. Many of the most important findings in biological research of the last 150 years or so — including the discovery of the CRISPR/Cas9 gene-editing tool — have been enabled by agar.4 Agarose, a derivative of agar, is also essential in molecular biology techniques like gel electrophoresis, where its porous gel matrix separates DNA fragments by size, enabling researchers to analyze and isolate specific genetic sequences.
If you’ve been wanting to upgrade your aerial photography setup, this weekend might be a great chance to do so. Amazon has DJI’s Mini 5 Pro on sale for almost a third off its list price, which is a pretty good deal. The Mini 5 Pro is an excellent sidekick for outdoor adventurers, aerial photography hobbyists, and professionals who want a compact, portable device.
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Urgent research needed to tackle AI threats, says Google AI boss，详情可参考体育直播
记者：5年过渡期，我们牢牢守住了不发生规模性返贫致贫的底线，请问这得益于哪些有力措施？